Hebrews 13:4

4 Marriage should be honored by all, and the marriage bed kept pure, for God will judge the adulterer and all the sexually immoral.

Read Hebrews 13:4 Using Other Translations

Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.
Let marriage be held in honor among all, and let the marriage bed be undefiled, for God will judge the sexually immoral and adulterous.
Give honor to marriage, and remain faithful to one another in marriage. God will surely judge people who are immoral and those who commit adultery.